Seeing Shadow Figures at Night? What Studies Show
Seeing shadow figures at night? A 35-study review, a 13,057-person survey, and a 2021 hypothesis on why they look faceless, and what the studies leave open.
Jem Jeins
10/23/20265 min read
Halloween asks for ghosts. Sleep research asks a duller question: how many ordinary people have woken unable to move, and why do some of them report a dark shape in the room?
Why do people see shadow figures at night? We found no study that measures shadow figures on their own, but related research shows that hallucinations at the edge of sleep are common (24.8% of 13,057 adults in a 2000 survey), that sleep paralysis affects 7.6% of people in a review of 35 studies, and that frightening episodes were more often tied to sleep or anxiety conditions. Below, each study's design, size and limits, plus questions that have no direct study behind them.
Key takeaways
Hypnagogia-Pass is not about visions: it is our method for the moment you lie down, 30 videos, more than 2,400 minutes in total, a word and a matching picture on a dark screen, no talking, soft background sound. It is something to try, not a treatment.
A 2011 review of 35 studies (about 36,500 people) found lifetime sleep paralysis in 7.6% of the general population, 28.3% of students and 31.9% of psychiatric patients.
A 2000 survey of 13,057 adults in three countries found hallucinations while falling asleep in 24.8%, and frightening ones were more often linked to sleep or anxiety conditions.
A 2021 paper proposes why the figures look faceless, but it is a hypothesis, not an experiment. We found no study measuring shadow figures themselves.
What do people see at the edge of sleep?
Three terms cover most of what the studies describe. Hypnagogic hallucinations happen while falling asleep, hypnopompic ones while waking, and sleep paralysis is the stretch of waking up unable to move. A 2021 paper in Medical Hypotheses describes these visions as common worldwide and says they often involve seeing and sensing shadow beings.
None of this is new to our readers if you have been through our guides on what hypnagogia is and whether hypnagogia is normal. The difference here is the figure: a person-shaped presence, usually dark and without a face, rather than a color, a shape or a sound.
How common is sleep paralysis? A review of 35 studies
A 2011 systematic review in Sleep Medicine Reviews by Sharpless and Barber pooled 35 studies that reported lifetime sleep paralysis, about 36,500 people in all. Across them, 7.6% of the general population, 28.3% of students and 31.9% of psychiatric patients had at least one episode. Among patients with panic disorder, the figure was 34.6%.
The limits: the studies asked people to report their own experience, and they used different ways of asking, so the numbers describe how often people say it happened, not how often it is measured in a lab. The authors called for sleep paralysis to be assessed more regularly. Our mind racing at night article covers the other side of the night: thoughts that will not slow.
Why do the figures look faceless? One hypothesis
The 2021 paper mentioned above offers a brain-based account. It proposes that the right hemisphere and the visual system's habit of taking shortcuts, which the author calls economizing, could explain why the ghost-like figures tend to appear as faceless shadows during sleep paralysis.
It is a hypothesis, and the author says so: the paper states that empirical research must test it, and suggests that people with damage to the implicated right-hemisphere regions should be less likely to see these figures. We found no study that has done this. The author, Baland Jalal, also wrote a plain-language version for TIME in March 2023, where he says the theory still needs verification through brain imaging and experiments. Our reasoning, not a study result: a figure with no face is also the simplest thing a half-awake visual system could produce, which is why it can feel so convincing.
When frightening visions point to something else
A 2000 survey in Psychiatry Research by Ohayon and colleagues phoned 13,057 people aged 15 or older in the United Kingdom, Germany and Italy. Hallucinations while falling asleep were reported by 24.8% and on waking by 6.6%, and in more than half of the cases they had no link to a specific condition. The frightening ones, however, were more often linked to sleep or mental disorders such as narcolepsy, sleep apnea or anxiety disorders.
The same survey found that visual hallucinations in the daytime, reported by 3.2%, were strongly related to psychotic conditions. A separate 2021 analysis in the British Journal of Psychiatry of 33,637 adults found past-year hallucinations in 7% of people aged 16 to 19 and 3% of those 70 and over, and in every age group they were linked to a higher risk of mental disorders. That study did not separate sleep from daytime, so it is a reminder, not a verdict on any one person's night. Our sleep anxiety survey article looks at how common anxious nights are.
Something to try tonight: what is Hypnagogia-Pass?
Hypnagogia is the drifting, half-lit stretch between waking and sleep, and Hypnagogia-Pass is our library of 30 videos, more than 2,400 minutes in total, curated by CantSwitchOff to walk you through the hypnagogic pass. Each session shows a word, then a matching picture, one after another on a dark screen, with no talking and soft background sound.
We found no study on whether any bedtime routine changes what people see at the edge of sleep, and we do not claim that Hypnagogia-Pass does. It is a method, not a treatment, inspired by published research on imagery before sleep that did not examine our videos. Why we built it tells the story, and our introduction to the method explains how it differs from cognitive shuffling. Try Hypnagogia-Pass tonight.
Your shadow figures questions, answered
Why do I keep seeing shadow figures at night?
We found no study that measures shadow figures on their own. The nearest research points to the edge of sleep: a 2000 survey of 13,057 adults found hallucinations while falling asleep in 24.8%, and a 2011 review found lifetime sleep paralysis in 7.6%. A 2021 paper says shadow beings are often part of those visions.
Is it normal to see shadow figures in sleep paralysis?
Seeing figures is a recognized part of sleep paralysis: a 2021 paper calls these visions common worldwide and says they often involve shadow beings. Sleep paralysis itself was reported by 7.6% of the general population in a review of 35 studies. How frightening an episode feels says little about how often it happens.
What does it mean when you see Shadow Man?
We found no study on what a Shadow Man means, and the spiritual or demonic readings people search for have no support in what we read. Researchers describe a vision at the edge of sleep, often during sleep paralysis. One 2021 hypothesis ties the faceless look to visual shortcuts; it is untested.
What mental illness sees shadow people?
We found no study tying shadow figures to one illness. In a 2000 survey of 13,057 adults, hallucinations at sleep onset were often unrelated to any condition, but frightening ones were more often linked to narcolepsy, sleep apnea or anxiety disorders. Daytime visual hallucinations were more strongly tied to psychotic conditions. See the note at the end of this article.
Can a calmer bedtime reduce frightening things seen before sleep?
We found no study testing a bedtime routine against shadow figures or other frightening visions before sleep, so the direct answer is unknown. The 2000 survey linked the frightening ones more often to sleep and anxiety conditions, so a routine alone may not be the whole picture. Hypnagogia-Pass has not been studied for this.
Know someone who's awake right now?
If you have a friend who has described a shape in the corner of the room, or someone you think needs this information, send them this article. It brings them what the studies found, in plain words. If you are awake yourself, this short post has a gentle thing to try.
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If you often see figures, or if what you see comes with other symptoms that worry you, please talk with a doctor. This article is general information, not medical advice, and Hypnagogia-Pass has not been tested in a clinical trial.